Once retrieved, the eggs are fertilized with sperm within a lab dish, with hopes of successful fertilization. The ensuing embryos are cultured and monitored for many times to guarantee best improvement. The eggs are noticed intently for signs of cell division, that is when fertilization is considered to get happened. https://www.digitaljournal.com/pr/news/insights-news-wire/ivf-mexico-best-fertility-clinic-1465491918.html